Ventilation opening for an aeration system

ABSTRACT

A ventilation opening for an aeration system, in particular of the air admission opening type, of the type comprising a body delimiting an air conveying duct and a flap pivotally mounted on the front facade of the body between a closed position and an open position, and further comprising a system for blocking the flap in the open position and in the closed position, comprising an elastically deformable locking blade that is fastened to the flap and provided with at least two stops and a stopping device incorporated to the front facade of the body and presenting at least two bearing elements, where the locking blade cooperates with a stopping device so that the flap passes from a closed position, wherein a stop of the locking blade bears against a bearing element, to an open position, wherein another stop of the locking blade bears against another bearing element, by initially pushing the flap against the front facade and then by spacing apart the cover from the front facade, and the flap passes from the open position to the closed position by pushing the flap against the front facade.

CROSS REFERENCE TO RELATED APPLICATION

This application is related to and claims the benefit of French Patent Application Number 13/62020 filed on 3 Dec. 2013, the contents of which are herein incorporated by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a ventilation opening for an aeration system, in particular of the air admission opening type.

BACKGROUND

In the field of ventilation of building rooms, such as for example kitchens and bathrooms, it is known to use ventilation openings for ensuring the renewal of fresh air within the rooms, by allowing admission of a flow of fresh air into the rooms.

Such ventilation openings can, optionally, be associated to air flow regulating or air flow modulating devices depending on physical parameters of the air, such as for example moisture.

According to numerous current regulations, a ventilation opening must be shaped so that the user can manually close the ventilation opening completely in order to interrupt the admission of air, or on the contrary completely open the ventilation opening in order to ensure a maximum air admission.

As such, it is known to employ ventilation openings provided with pivoting slats placed in front of an air admission of oblong shape, these slats being guided in rotation with a handle translating between a closed position with the substantially coplanar and overlapping slats, and an open position with the slats substantially perpendicular to the air admission.

It is also known to employ ventilation openings including a perforated air admission facade and presenting ports and a perforated flap rotatably mounted on the back of the facade and presenting ports identical to those of the facade, the flap being movable between a closed position in which it completely obstructs the ports of the facade and an open position in which the ports completely coincide with the ports of the facade to ensure maximum air admission through the two sets of ports.

However, these ventilation openings offer mechanisms which, over time, take wear and reduce the sealing.

A ventilation opening for a window frame is further known from document WO 2008/127167, comprising a flap formed by a profile rotatably movable on a frame. This flap presents, on its free edge, a hook shaped return that is an integral part of the flap, this return cooperating with a stopping part movable in translation on the frame to block the flap in the closed position. After the return of the flap is disengaged from the stopping part, thanks to the sliding of the stopping part, the flap is released and can be completely opened. This aeration opening presents a first drawback which is that the flap, once opened, is not maintained in an open position but tilts freely (under its own weight) until it is completely open, A second drawback is due to the complexity of the mechanism, which implements a stopping part slidable on the frame.

BRIEF SUMMARY

The present invention aims to propose a ventilation opening, to associate or not to a device for regulating air flow or modulating air flow, which incorporates a flap mechanism blockable in the open position and the closed position, which is easy to manipulate, responds effectively to the sealing requirements and is of simple and inexpensive design.

To this end, it proposes a ventilation opening for an aeration system, in particular of the air admission opening type, of the type comprising:

-   -   a body delimiting an air conveying duct presenting an aperture         opening out on a front facade of said body; and     -   a flap pivotally mounted on the front facade of said body         between a closed position of obstruction of the aperture in         which the flap is folded back against the front facade and         covers the opening, and an open position in which the flap is         spaced apart from the front facade in order to allow the passage         of air through the opening;         said opening being remarkable in that it further comprises a         system for blocking the flap in the open position and in the         closed position, comprising an elastically deformable blade         called locking blade that is fastened on the flap and provided         with at least two stops and a stopping device incorporated to         the front facade of the body and presenting at least two bearing         elements, where the locking blade cooperates with the stopping         device so that the flap passes from a closed position, in which         a stop of the locking blade bears against a bearing element, to         an open position, in which another stop of the locking blade         bears against another bearing element, by initially pushing the         flap against the front facade and then spacing apart the flap         from the front cover, and the flap passes from the open position         to the closed position by pushing the flap against the front         facade.

Therefore, the flap presents an edge pivotally mounted on the front facade of the body and the flap pivots between a closed position in which the flap is flattened against the front facade, and an open position in which it titled about its articulation and the edge of the flap opposite to the articulation is spaced apart from the front facade, so that in the open position the flap is maintained spaced apart vis-a-vis the front facade of the body, thanks to the locking blade of the blocking system, to allow the passage of air through the space between the flap and this front facade.

The blocking system allows easy passage from an open position to a closed position by pushing the flap, according to a dual pushing mechanism: a pushing to open the flap and pushing to close the flap.

According to one characteristic, the locking blade protrudes from the inner face of the flap and presents at least two stops, including a proximal stop and a distal stop, the proximal stop being closer to the inner face of the flap than the distal stop.

It is of course conceivable to provide a third stop on the locking blade, or even more, to multiply the number of positions of the flap.

According to another characteristic, the stopping device presents at least two bearing elements, including a first bearing element and a second bearing element.

In accordance with another advantageous characteristic of the invention:

-   -   in the closed position, the proximal stop of the locking blade         bears against the first bearing element and the locking blade is         in an elastically deformed state; and     -   in the open position, the distal stop bears against the second         bearing element and the locking blade is in a free state;         where the flap passes from the closed position to the open         position by pushing the flap against the front facade so that         the proximal stop of the locking blade leaves its bearing         against the first bearing element and recovers its free state,         and then by spacing apart the front part of the body until the         distal stop bears against the second bearing element;         and where the flap passes from the open position to the closed         position by pushing the flap against the front facade such that         the distal stop leaves its bearing against the second bearing         element, and the proximal stop of the locking blade comes into         contact with the first bearing element and the locking blade         deforms until said proximal stop repositions to bear against the         first bearing element.

In a particular embodiment, the locking blade presents a general “U” shape presenting two branches linked by a bend, including a main branch protruding from the inner face of the flap and a second branch forming a return, and the proximal stop is provided on one of the two branches and the distal stop is provided on the other one of the two branches, the distal stop being closer to the bend than the proximal stop.

Such a “U” shape advantageously allows to obtain an easily deformable locking blade which allows to create an offset between the two stops advantageous for ensuring the blocking of the two positions of the flap.

Advantageously, the proximal stop is provided on the secondary branch, in particular at its free end, and the distal stop is provided on the main branch.

In a particular embodiment, the locking blade presents a predefined width called main width and the stops are presented in the form of enlarged elements integral with the locking blade and which present each a width called secondary width greater than the main width.

Therefore, the stops on the locking blade are carried out by enlarging this locking blade in the areas which will form the stops; these enlargements therefore defining kinds of notches that fulfill the function of a stop.

According to one possibility of the invention, the first bearing element is shifted with respect to the second bearing element in the plane of the front facade of the body.

According to another possibility of the invention, the stopping device includes a frame delimited by two opposite facing edges, and the first bearing element is composed of at least one first protuberance protruding from one of said edges inwardly of the frame and the second bearing element is composed of at least one second protuberance protruding from the same edge as the first protuberance inwardly of the frame, the two protuberances being shifted with respect to one another along said edge, and the locking blade cooperates with the stopping device by engaging within said frame.

The present invention also concerns the characteristic according to which the first bearing element is composed of two first protuberances facing one another protruding from the respective edges of the frame inwardly of the frame, and the second bearing element is composed of two second facing protuberances protruding from the respective edges inwardly of the frame.

Advantageously, the stopping device satisfies the following conformation:

-   -   the gap between the two first protuberances is substantially         equivalent to the gap between the two second protuberances and         this gap is, on the one hand, substantially equivalent to or         greater than the main width of the locking blade and, on the         other hand, smaller than the secondary width of the stops; and     -   the gap between the two edges of the frame is substantially         equivalent to or greater than the secondary width of the stops.

According to one characteristic, the first bearing element presents a front surface, situated facing the flap, which forms a ramp inclined with respect to the front facade at a non-right and non-zero angle, so that the proximal stop is guided over this ramp when the flap passes from the open position to the closed position.

This form of ramp allows to guide and deform the locking blade when the flap passes from the open position to the closed position.

According to another characteristic, the first bearing element presents a rear surface, opposite to the flap, which forms a step defining a bearing plate for the proximal stop in the closed position.

Advantageously, the opening comprises at least one elastic recall member interposed between the front facade of the body and an inner face of the flap and biasing said flap towards its open position.

Therefore, when passing from the closed position to the open position, the recall member automatically ensures the gap of the flap after the initial pushing.

Advantageously, the recall member and the locking blade are integral, in particular by being carried out in one-piece.

In this manner, the dual function (locking and recall) is carried out by means of a single one-piece, thereafter called opening/closing part.

According to one possibility, the recall member includes an elastically deformable blade called recall blade presenting an end fastened to the inner face of the steering wheel and a lower end trapped between two stopping surfaces of the front facade.

Therefore, this recall blade exerts a spring function and a function of maintaining the flap very effectively: on the one hand, when the flap is raised on its pivot axis, the recall blade traps the flap and applies a force upwards to prevent its from escaping and, on the other hand, in the closed position, the recall blade bends and thus applies a transverse force which assists the opening of the flap.

In a particular embodiment, the flap is a solid flap, non-perforated and pivotally mounted on the front facade of the body, according to a pivot axis substantially parallel to the front facade.

According to one possibility of the invention, the flap is pivotally mounted on the front facade of the body by means of one or several male plugs protruding from one of the inner face of the flap and the front facade, the or each male plug being engaged in a groove provided on the other one of the inner face of the flap and the front facade.

Advantageously, the inner face of the flap is partially covered with a layer of compressible material, particularly with foam, which compresses under the effect of the initial pushing when the flap passes from the closed to the open position; this layer therefore forming a sealing joint.

According to a particular embodiment, the stopping device is placed on the outer or inner periphery of the aperture of the duct opening out on the front facade, this aperture being optionally filled with a filter which does not cover the stopping device.

Therefore, the stopping device can be housed inside the aperture and thus inside the duct, or outside the duct.

BRIEF DESCRIPTION OF THE DRAWINGS

Other characteristics and advantages of the present invention will become apparent on reading the detailed description below, a non-limitative example of implementation, with reference to the appended figures in which:

FIG. 1 is a perspective view of a ventilation opening in accordance with the invention, in a position called recessed position in which the flap is even more open than in the open position;

FIG. 2 is a perspective view of the opening of FIG. 1, with the sealing joint and the filter in place;

FIG. 3 is a perspective view of the back of the opening of FIG. 1;

FIGS. 4 and 5 are zoomed perspective views of the stopping device incorporated to the front facade of the body of the opening of FIG. 1, respectively front view (FIG. 4) and rear view (FIG. 5);

FIG. 6 is a schematic illustration in four angles of an opening/closing part employed in the opening of FIG. 1, with, from left to right, a front view, a side view, a back view and a perspective view;

FIG. 7 is a median sectional view of the opening of FIG. 1 in a closed position of the flap;

FIGS. 8 a to 8 c are zoomed partial views of the opening of FIG. 7 in the closed position and illustrating the cooperation of the locking blade with the stopping device, respectively rear view (FIG. 8 a), sectional perspective view (FIG. 8 b) and front view (FIG. 8 c);

FIG. 9 is a median sectional view of the opening of FIG. 1 in an open position of the flap;

FIGS. 10 a to 10 c are partial zoomed views of the opening of FIG. 7 in the closed position and illustrating the cooperation of the locking blade with the stopping device, respectively rear view (FIG. 10 a), sectional perspective view (FIG. 10 b) and front view (FIG. 10 c);

FIGS. 11 a to 11 f are median sectional views of the opening of FIG. 1 during the passage from the closed position (FIG. 11 a) to the open position (FIG. 11 f) through the various intermediate successive positions (FIGS. 11 b to 11 e);

FIGS. 12 a to 12 d are median sectional views of the opening of FIG. 1 during the passage from the open position (FIG. 12 a) to the closed position (FIG. 12 d) through the various intermediate successive positions (FIGS. 12 b and 12 c);

FIGS. 13 a to 13 d are median sectional views of the opening of FIG. 1 during the passage from the open position (FIG. 13 a) to the recessed position (FIG. 13 d) through the various intermediate successive positions (FIGS. 13 b and 13 c).

DETAILED DESCRIPTION

For the following description, the concept “front” refers to the inner side of the building part in which the ventilation opening is provided for implantation, and the concept “rear” refers to the opposite of the front.

Referring to the figures, the ventilation opening 1, in particular of the air admission opening type, includes a body 2 delimiting an air conveying duct presenting an aperture 20 opening out on a front facade 21 of the body 2.

The body 2 includes a shaft 22 disposed on the back of the front facade 21 and intended to be connected to an air circulation pipe, or even to an air flow regulating or air flow modulating device.

The body 2 includes a stopping device 23, fixed or static, incorporated to the front facade 21 and which includes a frame delimited in width by two opposite facing lateral edges 24, and delimited in height by a lower edge 25 and by the peripheral wall 26 of the front facade 21 that forms the periphery of the aperture 20 opening out in the front facade 21. In other words, the lateral edges 24 protrude from the peripheral wall 26 inwardly of the aperture 20 and these lateral edges 24 are linked by the lower edge 25. The two lateral edges 24 are spaced from one another by a given gap E1.

This stopping device 23 includes a first bearing element 27 which is composed of two facing first protuberances protruding from the respective lateral edges 24 of the frame inwardly of the frame.

The two first protuberances 27 each present a front surface 270 which forms a ramp inclined with respect to the front facade 21 at a non-right non-zero angle, and oriented from the front to the back towards the peripheral wall 26, in other words in a direction opposite to the lower edge 25 of the frame.

The two first protuberances 27 each present a rear surface 271 which forms a step defining a bearing plate recessed downwardly with respect to the top of the ramp 270; this bearing plate being substantially orthogonal to the lateral edges 24 and to the front facade 21.

The two first protuberances 27 are spaced from one another by a given gap E2, where E2 is smaller than E1.

This stopping device 23 includes a second bearing element 28 which is composed of two facing second protuberances 28 protruding from the respective lateral edges 24 of the frame inwardly of the frame.

The two second protuberances 28 each present a front surface and a rear surface planar and parallel to the front facade 21.

The two second protuberances 28 are spaced from one another by the same given gap E2.

The first protuberances 27 and the second protuberances 28 are shifted with respect to one another along the corresponding lateral edges 24, with the first protuberances 27 closer to the lower edge 25 and the second protuberances 28 closer to the peripheral wall 26.

The body 2 includes on the entire periphery of the front facade 21 of the flanges protruding from the front of the front facade 21. These flanges form a continuous border wall, and include a lower flange 29. Slugs 30 protrude from the lower flange 29 inwardly.

The front facade 21 presents, facing the slugs 30, a hole 31.

The body 2 presents, below the lower flange 29, a groove 32. The flanges also include an upper flange 33 facing the bottom flange 29, and the lateral flanges 34.

The opening 1 also includes a filter 8 filling the aperture 20, this filter 8 being shaped to circumvent the frame of the stopping device 23.

The opening 1 also incorporates a flap 4 pivotally mounted on the front facade 21 of the body 2 between:

-   -   a closed position (FIG. 7) for obstructing the aperture 20, in         which the flap 4 is folded back against the front facade 21 and         covers the aperture 20;     -   an open position (FIG. 9) allowing the passage of air through         the aperture 20, in which the flap 4 is spaced apart from the         front facade 21; and     -   a recessed or free position (FIG. 13 d) in which the flap 4 is         even more spaced apart from the front facade 21 than in the open         position, and the flap 4 is free to pivot under its own weight.

The flap 4 is a solid flap, non-perforated and is pivotally mounted on the front facade 21 of the body according to a pivot axis substantially parallel to the front facade 21, and more particularly substantially parallel to the lower flange 29 of the body 2.

The flap 4 includes a solid cowl 40 delimited on its periphery by flanges including an upper flange 41, a lower flange 42 and lateral flanges 43; these flanges 41, 42, 43 form a continuous border wall.

The flap 4 is of greater dimensions than the front facade 21 of the body 2, so that in the closed position, the flap 4 completely oversees the front facade 21 and the flanges 41, 42, 43 of the flap 4 cover the flanges 29, 33, 34 of the body 2. The upper flange 41 presents a slot 410 in order to be able to grip the flap 4.

The flap 4 presents an inner face 400 corresponding to the inner face of the cowl 40 which faces the front facade 21. The flap 4 includes male plugs 44 which protrude from the inner face 400 of the cowl 40, and which are close to the lower flange 42.

These male plugs 44 are engaged within the groove 32 of the body 2, in order to ensure the pivoting of the flap 4.

This male plugs 44 and groove 32 assembly forms an articulation hinge of the flap 4 in its lower portion.

The flap 4 also includes a retaining member 45 which protrudes from the inner face 400 of the cowl 40, and which is close to the upper flange 41. The retaining member 45 forms a notch or a hook.

The opening 1 also includes a sealing joint 9 composed of a compressible material layer, in particular with foam, flattened against the inner face 400 of the cowl 40; this sealing joint 9 being shaped to circumvent the retaining member 45.

The opening 1 also includes an opening/closing part 5 which is an elastically deformable part, and which includes a flat plate 50 and laterally presenting two lugs 51, and from which protrude two elastically deformable blades: an upper blade called locking blade 6 and a lower blade called recall blade 7.

The locking blade 6 protrudes orthogonally to the plate 50 and presents a general “U” shape presenting two branches 61, 62 linked by an bend 63, a main branch 61 protruding from the plate 50 and a secondary branch 62 forming a return and presenting a free end. Therefore, the locking blade 6 is separate from the flap 4, and this locking blade 6 is attached on this flap 4, more specifically on the inner face 400 of the cowl 40.

The locking blade 6 presents a proximal stop 64 and distal stop 65, the proximal stop 64 being closer to the plate 50 than the distal stop 65, in other words the distal stop 65 is closer to the bend 63 than the proximal stop 64.

The proximal stop 64 is provided on the secondary branch 62, and more specifically on its free end, while the distal stop 65 is provided on the main branch 61.

The distal stop 65 also presents an overthickness and protrudes on the top of the main branch 61.

The locking blade 6 presents a predefined width called main width LP and the stops 64, 65 are presented in the form of enlargements of the locking blade 6 in two respective specific areas, so that each stop 64, 65 presents a width called secondary width LS greater than the main width LP.

Concerning Dimensions:

-   -   the gap E2 between the protuberances 27, 28 is, on the one hand,         substantially equivalent to or greater than the main width LP of         the locking blade 6 and, on the other hand, smaller than the         secondary width LS of the stops 64, 65; and     -   the gap E1 between the lateral edges 27 of the frame of the         stopping device 23 is substantially equivalent to or greater         than the secondary width LS of the stops 64, 65.

The recall blade 7 is a planar blade inclined with respect to the plate 50 and which terminates by a free end 70.

In situation, the opening/closing part 5 is fastened to the inner face 400 of the flap 4 as follows: the plate 50 is mounted on the retaining member 45 which ensures the anchoring of the plate 50 on the cowl 40, the two lugs 51 ensuring the blocking of the plate 50 in the retaining member 45. In this way:

-   -   the locking blade 6 protrudes from the inner face 400 of the         flap 4 towards the front facade 21 of the body 2, and more         specifically towards the frame of the stopping device 23;     -   the recall blade 7 sees its free end 70 positioning itself         between the slugs 30 and the hole 31 (as shown in FIGS. 7 and         9), and therefore this recall blade 7 finds itself interposed         between the front facade 21 of the body 2 and the inner face 400         of the flap 4 and it biases the flap 4 to its open position.

In FIGS. 1 and 2, the free end of the recall blade 7 is not positioned between the slugs 30 and the hole 31, because the flap 4 is in a recessed position and the recall blade 7 is out of the hole 31.

The following description covers the blocking of the flap 4 in the open position and in the closed position, by means of the locking blade 6 which cooperates with the stopping device 23. The locking blade 6 cooperates with the stopping device 23 by engaging within the frame, between its lateral edges 24.

Referring to FIGS. 7, 8 a, 8 b and 8 c, in the closed position of the flap 4, the proximal stop 64 of the locking blade 6 bears against the rear surfaces 271 (and more specifically on the bearing plates) of two first protuberances 27, and the locking blade 6 is in an elastically deformed state in the direction of a closing in between the two branches 61, 62. In this closed position, the distal stop 65 is situated at the back, at a predefined distance from the two second protuberances 28.

Referring to FIGS. 9, 10 a, 10 b and 10 c, in the open position of the flap 4, the distal stop 65 bears against the rear surfaces of the two second protuberances 28, and the locking blade 6 is in a free state with the two branches 61, 62 more spaced apart from one another than in the aforementioned deformed state.

This open position is an intermediate position of aperture of the flap 4 between the closed position of FIG. 7 and the recessed or free position shown in FIG. 13 d, in which the locking blade 6 is no longer retained on the body 2. In other words, in the open position, the flap 4 is open (but not completely open) and the locking blade 6 cooperates with the body 2 to maintain the flap 4 in this open position, while in the recessed position, the flap 4 is also open, but the locking blade 6 no longer cooperates with the body 2 to retain the flap 4, the flap 4 is thereby free to tilt completely for a complete aperture.

Therefore, in the open position (maintained by the locking blade 6), the flap 4 pivoted by an angle comprised between 5 and 60° with respect to the closed position, or even between 10 and 45°, and the locking blade 6 maintains the flap 4 inclined at such an angle with respect to the closed position.

The following description covers the passage from the closed position to the open position, with reference to FIGS. 11 a to 11 f.

The flap 4 passes from the closed position (FIG. 11 a) to the open position (FIG. 11 f), by pushing the flap 11 b against the front facade 21 so that the proximal stop 64 of the locking blade 6 leaves its bearing against the first two protuberances 27 and recovers its free state, then by spacing apart the flap 4 of the front facade 21 of the body 2 (under the effect of the recall blade 7) until the distal stop 65 bears against the two second protuberances 28.

Referring to FIG. 11 a, we start from the closed position where the flanges 29, 33, 34 of the body 2 slightly compress the sealing joint 9 to ensure the sealing; a clearance J being provided between the flanges 29, 33, 34 and the inner face 400 of the cowl 40.

Referring to FIG. 11 b, the flap 4 is then pushed towards the body 2, as illustrated by the arrow P; the flanges 29, 33, 34 of the body 2 highly compressing the sealing joint 9, the clearance J enabling this pushing. Therefore, the proximal stop 64 of the locking blade 6 leaves its bearing against the first two protuberances 27 and recovers its free state.

Referring to FIGS. 11 c to 11 e, under the effect of the recall blade 7, the flap 4 is spaced apart from the front facade 21 of the body 2 and begins to pivot (arrows RO). As the locking blade 6 recovered its free state, the proximal stop 64 passes under the two first protuberances 27 (and more specifically between the two first protuberances 27 and the lower edge 25 of the frame).

Referring to FIG. 11 f, the pivoting of the flap 4 is interrupted when the distal stop 65 bears against the two second protuberances 28, and the flap 4 is therefore in its open position.

The following portion of the description covers the passage from the open position to the closed position, with reference to FIGS. 12 a to 12 d.

The flap passes from the open position (FIG. 12 a) to the closed position (FIG. 12 d) by pushing the flap 4 against the front facade 21 so that the distal stop 65 leaves its bearing against the two second protuberances 28, and the proximal stop 64 of the locking blade 6 comes into contact with the two first protuberances 27 and the locking blade 6 is deformed until the proximal stop 64 repositions to bear against the two first protuberances 27.

Referring to FIG. 12 a, we start from the open position with the distal stop 65 which bears against the two second protuberances 28 and the locking blade 6 in its free state.

Referring to FIGS. 12 b and 12 c, the flap 4 is pushed towards the body 2, as illustrated by the arrow P, and the flap 4 pivots in the closing direction (arrow RF), countering the force exerted by the recall blade 7. Therefore, the distal stop 65 leaves its bearing against the two second protuberances 28, and the proximal stop 64 begins to engage on the front surfaces 270 of the first two protuberances 27.

As a reminder, these front surfaces 270 form ramps that, progressively with the pushing P of the facade 4, will guide the proximal stop 64 along the ramps and will compress the locking blade 6.

Referring to FIG. 12 d, once the proximal stop 64 reaches the top of the ramps formed of the front surfaces 270 of the two first protuberances 27, the locking blade 6 expands and the proximal stop 64 falls onto the bearing plates formed on the rear surfaces of the first two protuberances 27.

The following description covers the passage from the open position to the recessed position, with reference to FIGS. 13 a to 13 d.

Referring to FIG. 13 a, we start from the open position with the distal stop 65 which bears against the two second protuberances 28 and the locking blade 6 in its free state.

Referring to FIG. 13 b, the top of the main branch 61 of the locking blade 6 is pressed downward, as illustrated by the arrow A, so that the distal stop 65 goes down and leaves its bearing against the two second protuberances 28.

Referring to FIGS. 13 c to 13 d, the flap 4 is allowed to open, as illustrated by the arrows RR, with the locking blade 6 which completely disengages from the stopping device 23.

In the recessed position of FIG. 13 d, the flap 4 is no longer retained on the body 2 by the locking blade 6, and therefore the flap 4 is free to pivot and tilt completely (under its own weight) until complete opening.

Of course the example of implementation discussed above is in no way limiting, and other improvements and details can be given to the opening of the invention, without departing from the scope of the invention where other designs of the locking blade can for example carried out. 

1. A ventilation opening for an aeration system, in particular of the air admission opening type, of the type comprising: a body delimiting an air conveying duct presenting an aperture opening out on a front facade of said body; and a flap pivotally mounted on the front facade of said body between a closed position of obstruction of the aperture wherein the flap is folded back against the front facade and covers the aperture, and an open position wherein the flap is spaced apart from the front facade to allow the passage of air through the aperture; said opening being wherein it further comprises a system for blocking the flap in the open position and in the closed position, comprising an elastically deformable blade called locking blade that is fastened to the flap and provided with at least two stops and a stopping device incorporated to the front facade of the body and presenting at least two bearing elements, where the locking blade cooperates with a stopping device so that the flap passes from a closed position, wherein a stop of the locking blade bears against a bearing element, to an open position, wherein another stop of the locking blade bears against another bearing element, by initially pushing the flap against the front facade and then by spacing apart the flap of the front facade, and the flap (4) passes from the open position to the closed position by pushing the flap against the front facade.
 2. The ventilation opening according to claim 1, wherein the locking blade protrudes from an inner face of the flap and presents at least two stops including a proximal stop and a distal stop, the proximal stop being closer to the inner face of the flap than the distal stop.
 3. The ventilation opening according to claim 2, wherein the stopping device presents at least two bearing elements, including a first bearing element and a second bearing element.
 4. The ventilation opening according to claim 2, wherein: in the closed position, the proximal stop of the locking blade bears against the first bearing element and the locking blade is in an elastically deformed state; and in the open position, the distal stop bears against the second bearing element and the locking blade is in a free state; where the flap passes from the closed position to the open position by pushing the flap against the front facade so that the proximal stop of the locking blade leaves its bearing against the first bearing element and recovers its free state, then discarding the flap of the front facade of the body until the distal stop comes to bear against the second bearing element; and where the flap passes from the open position to the closed position by pushing the flap against the front facade so that the distal stop leaves its bearing against the second bearing element, and the proximal stop of the locking blade comes into contact with the first bearing element and the locking blade is deformed until said proximal stop repositions to bear against the first bearing element.
 5. The ventilation opening according to claim 2, wherein the locking blade presents a general “U” shape presenting two branches linked by a bend, including a main branch protruding from the inner face of the flap and a secondary branch forming a return, and the proximal stop is provided on one of the two branches and the distal stop is provided on the other one of the two branches, the distal stop being closer to the bend than the proximal stop.
 6. The ventilation opening according to claim 5, wherein the proximal stop is provided on the secondary branch, in particular at its free end, and the distal stop is provided on the main branch.
 7. The ventilation opening according to claim 1, wherein the locking blade presents a predefined width called main width and the stops are in the form of enlarged elements integral with the locking blade and each presenting a width called secondary width greater than the main width.
 8. The ventilation opening according to claim 3, wherein the first bearing element is offset relative to the second bearing element in the plane of the front facade of the body.
 9. The ventilation opening according to claim 8, wherein the stopping device includes a frame delimited by two opposite facing edges, and the first bearing element is composed of at least a first protuberance protruding from one of said edges inwardly of the frame and the second bearing element is composed of at least one second protuberance protruding from the same edge as the first protuberance inwardly of the frame, the two protuberances being shifted with respect to one another along said edge, and the locking blade cooperates with the stopping device engaging within said frame.
 10. The ventilation opening according to claim 9, wherein the first bearing element is composed of two facing first protuberances protruding from the respective edges of the frame inwardly of the frame, and the second bearing element is composed of two facing second protuberances protruding from the respective edges inwardly of the frame.
 11. The ventilation opening according to claim 7, wherein: the gap between the two first protuberances is substantially equivalent to the gap between the two second protuberances and this gap is, on the one hand, substantially equivalent to or greater than the main width of the locking blade and, on the other hand, smaller than secondary width of the stops; and the gap (E1) between the two edges of the frame is substantially equivalent to or greater than the secondary width (LS) of the stops.
 12. The ventilation opening according to claim 3, wherein the first bearing element presents a front surface, situated opposite the flap, which forms a ramp inclined with respect to the front facade at a non-right and non-zero angle, so that the proximal stop is guided over this ramp when the flap (4) passes from the open position to the closed position.
 13. The ventilation opening according to claim 3, wherein the first bearing element presents a rear surface, facing the flap, which forms a stair defining a bearing plate for the proximal stop in the closed position.
 14. The ventilation opening according to claim 1, comprising at least one resilient recall member interposed between the front facade of the body and an inner face of the flap and biasing said flap to its open position.
 15. The ventilation opening according to claim 14, wherein the recall member and the locking blade are integral, in particular by being carried out in one-piece.
 16. The ventilation opening according to claim 14, wherein the recall member includes an elastically deformable blade called recall blade presenting an end fastened to the inner face of the steering wheel a lower end trapped between two stopping surfaces of the front facade.
 17. The ventilation opening according to claim 1, wherein the flap is a solid flap, non-perforated and pivotally mounted on the front facade of the body, according to a pivot axis substantially parallel to the front facade.
 18. The ventilation opening according to claim 17, wherein the flap is pivotally mounted on the front facade of the body by means of one or several male plugs protruding from one of the inner face of the flap and the front facade, the or each male plug being engaged in a groove provided on the other inner face of the flap and the front facade.
 19. The ventilation opening according to claim 1, wherein the inner face of the flap is partially covered by a layer of compressible material, in particular with foam, which compresses under the effect of the initial pushing of the flap when it passes from the closed position to the open position.
 20. The ventilation opening according to claim 1, wherein the stopping device is placed on the inner or outer periphery of the aperture of the duct opening out on the front facade, this aperture being optionally filled with a filter which does not cover the stopping device. 